predictably: Caetano (faves are Transa & Joia at the moment)
and Gilberto (best of the Early Years - on Wrasse)
more obscurely, the great Rosinha De Valenca
- 'Um Violao em Primeiro Plano'
and the self titled album

On a slightly different slant I like the two Smoke City albums ( Chris Franck and Nina Miranda ) 'Flying Away' and 'Heroes of Nature'

On the compilation front
David Byrne put out a couple of good ones on the Luakabop label 'Beleza Tropical 1 & 2
and the Brazilian Love Affair series on Far Out .
I always have Pure Braziliance mixed by Faze Action in the car for when the sun shines, haven't played it this year yet.

The Barbican concert 50 Years of Bossa Nova line up on the 26th May looks like it could be a good one.

Some years back, Charlie - quite justifiably - championed Suba's "Sao Paulo Confessions". The poor guy may have been Polish, but the album that he made seemed to be pretty distinctively rooted in the place where it was created - and it still sounds good nearly 10 years later.